[Patch v5 08/13] ARM: imx6q: add config-on-boot gpios

[Chen Peter-B29397]

> 
> But like you said, there's no way to tell what's attached to a USB or
> SDIO port before probing it, at least if the port is at all
> user-accessible. The class driver for the host-side of the port (USB hub
> or SDIO controller) would be the one that needs to implement this, not
> the class driver for the thing that could be plugged in (WiFi or 3G
> device).
> 
Agree, I did not consider the situation that the class driver is loaded as 
module and only be loaded when that kinds of device (wifi/3g) has found
(through udev).

Maybe we have to add misc control (power/reset) for devices at sd or usb 
controller driver's probe, and those gpio are belonged to controller's.  

> > But the generic 3G and HUB devices are special, there is only one
> common driver
> > for each of them (drivers/usb/core/hub.c & drivers/serial/option.c)